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Article ISSN 1175-5334 (Online Edition) Urn:Lsid:Zoobank.Org:Pub:8D7DBC1C-E597-4561-8AB4-DA6297CBAAA6 Zootaxa 3497: 1–16 (2012) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA Copyright © 2012 · Magnolia Press Article ISSN 1175-5334 (online edition) urn:lsid:zoobank.org:pub:8D7DBC1C-E597-4561-8AB4-DA6297CBAAA6 Review of the Campsicnemus fumipennis group (Diptera: Dolichopodidae) in the Hawaiian Islands, with descriptions of new species and corrections of misidentifications NEAL L. EVENHUIS Hawaii Biological Survey, Bishop Museum, 1525 Bernice Street, Honolulu, Hawai‘i 96817-2704, USA. E-mail: [email protected] Abstract Species of the Campsicnemus fumipennis group in the Hawaiian Islands are reviewed. Campsicnemus fumipennis Parent, previously thought to be widespread in the Hawaiian Islands is found to be restricted only to the islands of Moloka‘i and Maui (= geological Maui Nui). Based on comparison of the lectotype female of C. fumipennis with females of C. flaviventer Hardy & Kohn, C. flaviventer is found to be synonymous with C. fumipennis, syn. nov. Three new species, two of them previously misidentified as either C. fumipennis or C. flaviventer, are described and illustrated; all are island endemics: C. leucostoma, sp. nov. (Hawai‘i), C. spectabulus, sp. nov. (O‘ahu), and C. aniani, sp. nov. (Hawai‘i). The first description of the male of true C. fumipennis is given, a key to species of the C. fumipennis group is presented, and a table of rearing records for immatures of species in the C. fumipennis group is given. Key words: Taxonomy, Diptera, Dolichopodidae, Campsicnemus, Hawaiian Islands, O‘ahu, Maui, Moloka‘i, Hawai‘i, Maui Nui Introduction The well isolated and tiny Pacific archipelago of the Hawaiian Islands is home to an incredible 170 or so endemic species of the predaceous long-legged fly genus Campsicnemus Haliday—with many more newly discovered species awaiting description. The vast majority of these species are small, clear-winged species whose main characters of differentiation are found in the variety of shapes, sizes, and setal patterns of the mid legs of the males, yet there are a few larger species to be found and also a few smaller species have body parts other than male mid legs that can be used to characterize species. But there is one species originally found almost 80 years ago in the valley of a rugged mountain stream on eastern Moloka‘i that stands out from them all in its size and striking wing and body pattern. This paper reviews the history of discovery and description of Campsicnemus fumipennis Parent from eastern Moloka‘i and describes new species from islands other than Moloka‘i that were previously misidentified as C. fumipennis. Materials and methods Material examined during this study derived from specimens in the Bishop Museum (BPBM), Hawaii Volcanoes National Park (HAVO), University of Hawaii Insect Museum (UHM), and original Hawaiian Sugar Planters’ Association (HSPA) material that was transferred to the Hawaii Department of Agriculture (HDOA). Holotypes and paratypes of all new species are deposited in BPBM. Specimens collected by permit on National Park lands listed as in BPBM are held in trust for the National Park system in BPBM. Some specimens have BPBM database numbers [BPBM Ent 2008xxxxxx]. These are given in square brackets after the collector. Terminology and Accepted by B. Sinclair: 5 Sep. 2012; published: 25 Sept. 2012 1 abbreviations follow recent papers on Hawaiian Campsicnemus (e.g., Evenhuis 2011, 2012); scutellar setation is different than most species of Hawaiian Campsicnemus and its descriptive formula is explained in the diagnosis for the species group. Male terminalia of all species were examined but are not illustrated as they are (as for most Campsicnemus species) virtually similar and offer no visible characters to separate species. Untangling the misidentifications of Campsicnemus fumipennis and allies In the midst of a paper that treated ten new species of dolichopodids from the Hawaiian Islands (including seven new species of Campsicnemus) that were sent to him for identification by F.X. Williams, Octave Parent (1937: 76) described a truly singularly remarkable species of Campsicnemus when he described Campsicnemus fumipennis. It is about twice the size of many other Hawaiian species, and is conspicuous in that both males and females have a marked fumose wing pattern and the abdomen is strikingly patterned with black and yellow. It is apparently this striking pattern of wing and body as well as size that has duped Hawaiian Diptera taxonomists since soon after its discovery. All subsequent workers (including me) when identifying specimens from surveys and collections placed all of the large strikingly patterned species into fumipennis and, following the island distribution given in Tenorio (1969), it was generally thought that this was simply a widespread species. The history of why there has been confusion as to the true identity of C. fumipennis begins with its original description. Since virtually all female Campsicnemus are fairly drab and look alike (lacking the male secondary sexual characters on the legs or other body parts that distinguish species), taxonomists normally do not describe new species of Campsicnemus based only on females. Exceptions of course can be made when there are distinctive body or wing patterns not found in any other species (in males or females). This is what happened with C. fumipennis. Parent (1937: 76) had no males of this species and described C. fumipennis based only on an unspecified number of females from eastern Moloka‘i; and he no doubt thought it was safe to do so since no other Campsicnemus had such heavily patterned wings or abdomen. When Williams (1938) gave his excellent account of the biology of C. fumipennis from O‘ahu, he made his identification based on the wing and abdominal patterning: males and females from his O‘ahu locality of Lulumahu Stream looked virtually identical to the Moloka‘i female specimen(s) from which the species was described by Parent (and Williams had the Molokai specimen(s) at hand to compare since he was working at the HSPA where the types were then located). However, this is where things started to go wrong. When Hardy and Kohn (1964) revised the genus in Hawai‘i, males of C. fumipennis from Moloka‘i were still not known, but since females from Lulumahu Stream had the same wing and body pattern, it was thought a safe assumption by Hardy and Kohn that the males from the same population on O‘ahu were males of C. fumipennis: “The male of this species has not been seen from Molokai but female specimens from Oahu seem to fit the type in all details, and the species is probably correctly placed” (Hardy & Kohn, 1964: 93). Being convinced that the O‘ahu male in Williams’s (1938) paper was C. fumipennis caused Hardy and Kohn (1964: 88) to make an error in describing C. flaviventer as a new species. The type of the latter species is also from Moloka‘i but the male has a significantly different leg setation pattern than the O‘ahu specimens that Williams and Hardy & Kohn had thought was C. fumipennis. Interestingly, no mention is made by Hardy and Kohn (1964) of the conspicuous wing pattern in the diagnosis paragraph for that species. Rather than state it was similar to C. fumipennis in wing and abdominal patterning, Hardy and Kohn instead gave weight to the leg characters and said C. flaviventer was on that basis related to C. diamphidius Hardy & Kohn from Maui. Examination of the paratype material of C. flaviventer and now knowing the taxonomy of the species within this group helps explain why Hardy and Kohn discounted the wing pattern in diagnosing C. flaviventer. Their paratype material included specimens from Molokai, Maui, and Hawai‘i. The distinctive wing pattern of specimens from Moloka‘i also holds for the Maui specimens, but fades dramatically in specimens from the Big Island of Hawai‘i, yet all have the distinctive abdominal patterning. Hardy and Kohn no doubt felt that C. flaviventer was variable in wing pattern thus did not put any weight on this character in their diagnosis and did not compare that patterning to the wings of other Hawaiian species of Campsicnemus. The characters of setal pattern on the male mid leg seemed to them to be more consistent so that is what they used as the primary character in characterizing their new species and no doubt caused them to not relate it to C. fumipennis since the setal pattern of the male mid leg of the O‘ahu specimens were so different. 2 · Zootaxa 3497 © 2012 Magnolia Press EVENHUIS After examination of over 120 specimens in this study from O‘ahu, Moloka‘i, Maui, and the Big Island, it is here concluded that: (1) O‘ahu, Maui Nui (the ancient geological land mass that once included Molokai, Maui, and Lāna‘i) and the Big Island of Hawai‘i each has its own endemic species (with two from the Big Island), with new species described from O‘ahu and the Big Island; (2) that true C. fumipennis is restricted to Maui Nui (on Moloka‘i and Maui — not yet found on Lāna‘i); (3); that C. flaviventer (the holotype male from Moloka‘i and all other Moloka‘i and Maui specimens) is synonymous with C. fumipennis, syn. nov. (4) that specimens identified as C. flaviventer from the Big Island belong to a new species, C. aniani, sp. nov. and (5) specimens identified as C. fumipennis from O‘ahu belong to a new species C. spectabulus, sp. nov. A third new species from the Big Island is newly discovered and, although it does not have a patterned wing, it is placed here in the C. fumipennis group based on antennal and male mid tibial characters and the patterning of the thorax and abdomen.
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